org.apache.hadoop.hive.ql.udf.generic
Class GenericUDFMacro

java.lang.Object
  org.apache.hadoop.hive.ql.udf.generic.GenericUDF
      org.apache.hadoop.hive.ql.udf.generic.GenericUDFMacro

All Implemented Interfaces:

Closeable, Serializable

public class GenericUDFMacro
extends GenericUDF
implements Serializable

GenericUDFMacro wraps a user-defined macro expression into a GenericUDF interface.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

GenericUDF.DeferredJavaObject, GenericUDF.DeferredObject

Constructor Summary

GenericUDFMacro()

GenericUDFMacro(String macroName, ExprNodeDesc bodyDesc, List<String> colNames, List<TypeInfo> colTypes)

Method Summary

Object	evaluate(GenericUDF.DeferredObject[] arguments) Evaluate the GenericUDF with the arguments.
ExprNodeDesc	getBody()
List<String>	getColNames()
List<TypeInfo>	getColTypes()
String	getDisplayString(String[] children) Get the String to be displayed in explain.
String	getMacroName()
ObjectInspector	initialize(ObjectInspector[] arguments) Initialize this GenericUDF.
boolean	isDeterministic()
boolean	isStateful()
void	setBody(ExprNodeDesc bodyDesc)
void	setColNames(List<String> colNames)
void	setColTypes(List<TypeInfo> colTypes)
void	setMacroName(String macroName)

Methods inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

close, configure, copyToNewInstance, flip, getRequiredFiles, getRequiredJars, getUdfName, initializeAndFoldConstants

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GenericUDFMacro

public GenericUDFMacro(String macroName,
                       ExprNodeDesc bodyDesc,
                       List<String> colNames,
                       List<TypeInfo> colTypes)

GenericUDFMacro

public GenericUDFMacro()

Method Detail

isDeterministic

public boolean isDeterministic()

isStateful

public boolean isStateful()

initialize

public ObjectInspector initialize(ObjectInspector[] arguments)
                           throws UDFArgumentException

Description copied from class: GenericUDF

Initialize this GenericUDF. This will be called once and only once per GenericUDF instance.

Specified by:

initialize in class GenericUDF

Parameters:

arguments - The ObjectInspector for the arguments

Returns:

The ObjectInspector for the return value

Throws:

UDFArgumentException - Thrown when arguments have wrong types, wrong length, etc.

evaluate

public Object evaluate(GenericUDF.DeferredObject[] arguments)
                throws HiveException

Description copied from class: GenericUDF

Evaluate the GenericUDF with the arguments.

Specified by:

evaluate in class GenericUDF

Parameters:

arguments - The arguments as DeferedObject, use DeferedObject.get() to get the actual argument Object. The Objects can be inspected by the ObjectInspectors passed in the initialize call.

Returns:

The

Throws:

HiveException

getDisplayString

public String getDisplayString(String[] children)

Description copied from class: GenericUDF

Get the String to be displayed in explain.

Specified by:

getDisplayString in class GenericUDF

setMacroName

public void setMacroName(String macroName)

getMacroName

public String getMacroName()

setBody

public void setBody(ExprNodeDesc bodyDesc)

getBody

public ExprNodeDesc getBody()

setColNames

public void setColNames(List<String> colNames)

getColNames

public List<String> getColNames()

setColTypes

public void setColTypes(List<TypeInfo> colTypes)

getColTypes

public List<TypeInfo> getColTypes()